Canon MG6600 series Online Manual page 782

Make sure that Enable bidirectional support is selected in the Ports sheet of
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the properties dialog box of the printer driver.
Make sure that the firewall of the security software is disabled.
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If the firewall function of your security software is turned on, a message may appear warning that Canon
software is attempting to access the network. If the warning message appears, set the security software to
always allow access.
If using any programs that switch the network environment, check their settings. Some programs will enable a
firewall by default.
When using a router, connect the machine and computer to the LAN side
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(same network segment).
If the problem is not resolved, perform setup again with the Setup CD-ROM or perform it according to the
instructions on our website.
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